CN109321825A - A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method - Google Patents
A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 116
- 239000010959 steel Substances 0.000 title claims abstract description 116
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000005516 engineering process Methods 0.000 title claims abstract description 29
- 238000005096 rolling process Methods 0.000 claims abstract description 23
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000003723 Smelting Methods 0.000 claims description 15
- 238000005097 cold rolling Methods 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 11
- 238000000137 annealing Methods 0.000 claims description 10
- 238000009749 continuous casting Methods 0.000 claims description 10
- 238000005554 pickling Methods 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000005261 decarburization Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000003009 desulfurizing Effects 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910000885 Dual-phase steel Inorganic materials 0.000 claims description 2
- 230000018109 developmental process Effects 0.000 abstract description 6
- 238000007493 shaping process Methods 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 229910000734 martensite Inorganic materials 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910000529 magnetic ferrite Inorganic materials 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001325 element alloy Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000116 mitigating Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The invention discloses a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steels, component comprising following weight percent: C:0.06~0.08%, Si:0.05~0.10%, Mn:1.05~1.15%, P :≤0.010%, S :≤0.005%, Alt:0.020~0.050%, Cr:0.20~0.30%.The invention also discloses the production methods of cold-rolled biphase steel.Cold-rolled biphase steel and its production method of the invention, by parameter in optimal control component content and rolling mill practice, the ton steel production cost of obtained cold-rolled biphase steel is low, and yield tensile ratio is low, initial manufacture hardening rate is high, with good cold machine-shaping, yield strength with higher after forming；Wide market is conducive to the needs for meeting social development, and the production method of cold-rolled biphase steel of the invention, preparation method is simple, is suitble to industrialized production.
Description
Technical field
The present invention relates to metallurgical plate technical field more particularly to a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and
Its production method.
Background technique
China's automobile sales volume in 2017 breaks through 2887.89 ten thousand, the continuous 9 years residences whole world first, it is contemplated that automobile produced in 2025
Amount reaches 35,000,000.As the burst of auto output increases, environment and energy crisis are increasingly sharpened, and energy-saving and emission-reduction have become
The significant problem that auto manufacturing faces.The weight for mitigating components or vehicle with modern technologies and method, pacifies ensureing
Under the premise of congruent performance, realize that energy-saving and emission-reduction consumption reduction target has become common recognition by loss of weight, automotive light weight technology technology has become
For the trend of current automotive industry.
Cold-rolled biphase steel is by two phase composition of ferrite and martensite, based on phase transformation strengthening, has preferable low in the wrong strong
Than, high initial manufacture hardening rate, good intensity and ductility cooperate the features such as, have evolved into a kind of automobile high-strength
New Type Punching Steel.Cold-rolled biphase steel is in automobile structure and covering application aspect: comparing low-alloy high-strength steel, carbon structure
Steel and baking hardened steel, under the premise of same intensity rank, steel plate is thinner, becomes apparent from for automotive light weight technology weight loss effect,
And yield strength with higher after shaping, make part that there is preferable concave resistance；Therefore cold-rolled biphase steel is automobile covering
Preferable selection in terms of part and ordinary construction part, has broad application prospects.
Currently, cold-rolled biphase steel disclosed in the prior art, the Nb containing high level in disclosed 440MPa grades of cold-strip steel
Element (0.050%) and Ti element, Nb and Ti alloy is expensive, increases ton steel cost；Contain in disclosed 450MPa cold-rolled biphase steel
Si (0.3%) and Mn (1.5%) are higher, increase ton steel cost, and Si content height easily causes steel strip surface iron scale to be difficult to
Removal increases pickling difficulty, and steel strip surface quality is more difficult to control, and Mn content height influences steel band welding performance；Existing skill also
Cr (0.5%) and Mn (1.5%) is higher in other disclosed 450MPa cold-rolled biphase steels of art, also increases ton steel cost；Therefore,
450MPa grades of automotive light weight technology cold-rolled biphase steel novel to Optimal Development improves two-phase steel quality and optimizes the production of dual phase steel
There is an urgent need for method.
Therefore, those skilled in the art is dedicated to developing a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its life
Production method.
Summary of the invention
In view of the drawbacks described above of the prior art, the technical problem to be solved by the present invention is to 450MPa grades of vapour in the prior art
Vehicle lightweight cold-rolled biphase steel Nb element (0.050%) and Ti, Si constituent content are high, and ton steel cost is high, steel strip surface quality compared with
It is difficult to control.
To achieve the above object, the present invention provides a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel, it includes with
The component of lower weight percent: C:0.06~0.08%, Si:0.05~0.10%, Mn:1.05~1.15%, P :≤
0.010%, S :≤0.005%, Alt:0.020~0.050%, Cr:0.20~0.30%.
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of C is 0.068%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of C is
0.071%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of C is 0.08%；
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Si is 0.05%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Si is
0.07%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Si is
0.10%；
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Mn is 1.08%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Mn is
1.10%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Mn is
1.12%；
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of P is 0.005%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of P is
0.008%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of P is
0.010%；
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of S is 0.002%；
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of S is 0.003%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Alt is
0.030%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Alt is
0.045%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Alt is
0.050%；
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Cr is 0.23%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Cr is
0.25%；
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Cr is
0.30%；
Another aspect of the present invention provides a kind of production method of 450MPa grades of automotive light weight technology cold-rolled biphase steel, including will
Slab carries out hot rolling, pickling and cold-rolling and continuous annealing treatment and obtains the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
Further, the production method of the 450MPa grades of automotive light weight technology cold-rolled biphase steel, specific steps include:
Step 1, smelting and continuous casting: carrying out converter smelting using the molten iron of desulfurization pretreatment makes molten steel decarburization, dephosphorization, carries out
Cleaning, slow cooling, obtain slab after LF refining and sheet billet continuous casting；
Step 2, hot rolling: by the laggard horizontal high voltage water dephosphorization of heating of plate blank, hot-strip is obtained after roughing and finish rolling；
Step 3, pickling and cold-rolling: by the hot-strip after hot rolling through chlorohydric acid pickling, with the cooling velocity of 20~25 DEG C/s
For cooling temperature to 650 DEG C, cold rolling obtains cold-rolled strip coil of strip；
Step 4, annealing: 800 ± 20 DEG C will be heated to after the band uncoiling of cold-strip steel coil, 80~120S be kept the temperature, with 3~5
DEG C/speed of s is cooled to 680 ± 20 DEG C, 280 ± 20 DEG C then are cooled to the cooling velocity greater than 45 DEG C/s, Wetted constructures
It is cooled to 150 DEG C after 400~500S eventually, is air-cooled to room temperature and obtains the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
Further, the production method of the cold-rolled biphase steel, in the step 1, converter smelting tapping temperature is 1630
~1650 DEG C；
Further, the production method of the cold-rolled biphase steel in the step 1, refines temperature >=1560 DEG C in place；
Further, the production method of the cold-rolled biphase steel, in the step 2, slab heating temperature is 1220~
1235 DEG C, heating time is 220~235min；
Further, the production method of the cold-rolled biphase steel, in the step 2, the start rolling temperature of finish rolling is 1030~
1040℃；
Further, the production method of the cold-rolled biphase steel, in the step 2, the finishing temperature of finish rolling is 860~
880℃；
Further, the production method of the cold-rolled biphase steel, in the step 2, hot-strip is with a thickness of 4mm；
Further, the production method of the cold-rolled biphase steel, in the step 3, cold rolling reduction ratio is 62.5%；
Further, the production method of the cold-rolled biphase steel, in the step 3, cold-rolled strip coil of strip is with a thickness of 1.5mm；
Using above scheme, cold-rolled biphase steel disclosed by the invention and its production method are had following technical effect that
(1) cold-rolled biphase steel of the invention, ingredient are free of expensive metal Nb and Ti, and Si content is low lower than 0.1%, Cr content
In 0.30%, and Mn content is lower than 1.15%, reduces a ton steel production cost, is relatively easy to control steel strip surface quality；
(2) cold-rolled biphase steel of the invention, microscopic structure be ferrite+martensite, Martensite Volume Fraction be 9%~
12%, about 11.5 grades of grain size, there is low yield strength ratio, high initial manufacture hardening rate, good intensity and ductility matching etc.
Feature, meets the needs of automotive light weight technology selection, and mechanical property and processing performance meet the requirement of GB/T20564.2-2006；
(3) cold-rolled biphase steel of the invention, in automobile structure and covering application aspect, compared to low-alloy high-strength steel,
Structural carbon steel and baking hardened steel, under the premise of same intensity rank, steel plate is thinner, is automotive light weight technology weight loss effect
It becomes apparent from, while the yield tensile ratio of cold-rolled biphase steel is low, initial manufacture hardening rate is high, has good cold machine-shaping, at
Yield strength with higher after shape makes part that there is preferable concave resistance and high shock to absorb energy, while being not required to add
The noble metals such as Nb, Mo reduce cost of alloy, wide market.
In conclusion cold-rolled biphase steel and its production method of the invention, pass through optimal control component content and rolling
The parameters such as heating temperature, rolling temperature in technique, obtained cold-rolled biphase steel ton steel production cost, yield tensile ratio is low, initial manufacture
Hardening rate is high, has good cold machine-shaping, yield strength with higher after forming；There is part preferable anti-
Concavity can absorb energy with high shock, and wide market is conducive to the needs for meeting social development, cold rolling two-phase of the invention
The production method of steel, preparation method is simple, is suitble to industrialized production.
Make below with reference to technical effect of the specific embodiment to design of the invention, specific structure and generation further
Illustrate, to fully understand the purposes, features and effects of the present invention.
Detailed description of the invention
Fig. 1 is 1 cold-rolled biphase steel micro-organization chart of the embodiment of the present invention；
Specific embodiment
The preferred embodiment of the present invention introduced below keeps its technology contents more clear and is easy to understand.The present invention can be with
It is emerged from by many various forms of embodiments, protection scope of the present invention is not limited only to the implementation mentioned in text
Example.
The preparation of embodiment 1, cold-rolled biphase steel
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting
The whole Argon of smelting, steel scrap addition converter, 1640 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace
Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component
As shown in table 1.The sheet billet continuous casting degree of superheat is 20 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later, obtains plate
Base；
Slab heating temperature is 1235 DEG C, heating time 220min, and the slab after heating is carried out high pressure water dephosphorization.It is logical
Fixed-width pressure machine fixed width is crossed, using 2 rack roughing, 7 rack CVC finish rolling.1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature is
860 DEG C, obtain hot-strip, finished product thickness 4.0mm；
Section cooling is cooling using front, and 20 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot
Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy
Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is
62.5%, it is rolled to target thickness 1.5mm, obtains cold-rolled strip coil of strip；
The continuous annealing of cold-rolled strip coil of strip carries out in the vertical continuous annealing furnace with HGJC function, and steel band is run in furnace area
Speed is 120m/min, 800 DEG C of soaking temperature, soaking time 120S, 680 DEG C of rapid cooling start temperature, 45 DEG C/S of rapid cooling cooling rate, mistake
282 DEG C of aging temp, overaging time 440S, 150 DEG C of final cooling temperature, smooth elongation percentage 1.0%, be air-cooled to room temperature obtain it is described
450MPa grades of automotive light weight technology cold-rolled biphase steels.
Embodiment 2
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting
The whole Argon of smelting, steel scrap addition converter, 1630 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace
Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component
As shown in table 1.The sheet billet continuous casting degree of superheat is 25 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later, obtains plate
Base；
Slab heating temperature is 1230 DEG C, and the time of heating is 230min, and the slab after heating is carried out high pressure water dephosphorization.
By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.1040 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature
It is 870 DEG C, obtains hot-strip, finished product thickness 4.0mm.
Section cooling is cooling using front, and 25 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot
Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy
Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is
62.5%, it is rolled to target thickness 1.5mm, obtains cold-rolled strip coil of strip；
The continuous annealing of cold-rolled strip coil of strip carries out in the vertical continuous annealing furnace with HGJC function, and steel band is run in furnace area
Speed is 150m/min, 820 DEG C of soaking temperature, soaking time 100S, 680 DEG C of rapid cooling start temperature, 50 DEG C/S of rapid cooling cooling rate, mistake
291 DEG C of aging temp, overaging time 400S, 150 DEG C of final cooling temperature, smooth elongation percentage 1.0%, be air-cooled to room temperature obtain it is described
450MPa grades of automotive light weight technology cold-rolled biphase steels.
Embodiment 3
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting
The whole Argon of smelting, steel scrap addition converter, 1650 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace
Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component
As shown in table 1.The sheet billet continuous casting degree of superheat is 30 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later, obtains plate
Base；
Slab heating temperature is 1220 DEG C, and the time of heating is 235min, and the slab after heating is carried out high pressure water dephosphorization.
By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature
It is 879 DEG C, obtains hot-strip, finished product thickness 4.0mm obtains cold-rolled strip coil of strip；
Section cooling is cooling using front, and 23 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot
Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy
Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is
62.5%, it is rolled to target thickness 1.5mm；
The continuous annealing of cold-rolled strip coil of strip carries out in the vertical continuous annealing furnace with HGJC function, and steel band is run in furnace area
Speed 140m/min is 812 DEG C of holding temperature, soaking time 108S, 680 DEG C of rapid cooling start temperature, rapid cooling cooling rate 55 DEG C/S, out-of-date
285 DEG C of temperature, overaging time 460S, 150 DEG C of final cooling temperature of effect, smooth elongation percentage 1.0%, be air-cooled to room temperature obtain it is described
450MPa grades of automotive light weight technology cold-rolled biphase steels.
The cold-rolled biphase steel constituent content that detection Examples 1 to 3 obtains, the results are shown in Table 1.
1 unit of table: %
| Embodiment | C | Si | Mn | P | S | Alt | Cr |
| 1 | 0.080 | 0.05 | 1.08 | 0.010 | 0.003 | 0.045 | 0.23 |
| 2 | 0.071 | 0.10 | 1.10 | 0.008 | 0.003 | 0.030 | 0.25 |
| 3 | 0.068 | 0.07 | 1.12 | 0.005 | 0.002 | 0.050 | 0.23 |
Mechanical properties test is carried out to the cold-rolled biphase steel that the embodiment of the present invention 1~3 obtains, inspection result is shown in Table 2.
Table 2
As can be seen from Table 2, the yield tensile ratio for the cold-rolled biphase steel that the embodiment of the present invention 1~3 obtains is 0.55~0.58, elongation percentage
It is 29%~30%, tensile strength is 515~529MPa, and the cold-rolled biphase steel that the expression embodiment of the present invention 1~3 obtains has low
Yield tensile ratio, high initial manufacture hardening rate, good intensity and ductility matching；
The cold-rolled biphase steel obtained to inventive embodiments 1 is observed, and microscopic structure is as shown in Figure 1, microscopic structure is
Ferrite+martensite, Martensite Volume Fraction are 9%~12%, and about 11.5 grades of grain size, the display embodiment of the present invention 1 obtains
Cold-rolled biphase steel it is high-quality.
Other technologies scheme of the present invention also has similar beneficial effect.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (7)
1. a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel, which is characterized in that the component comprising following weight percent: C:
0.06~0.08%, Si:0.05~0.10%, Mn:1.05~1.15%, P :≤0.010%, S :≤0.005%, Alt:
0.020~0.050%, Cr:0.20~0.30%.
2. a kind of production method of 450MPa grades of automotive light weight technology cold-rolled biphase steel, which is characterized in that including slab is carried out heat
It rolls, pickling and cold-rolling and continuous annealing treatment obtain the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
3. method as claimed in claim 2, which is characterized in that the specific steps of the production method include:
Step 1, smelting and continuous casting: carrying out converter smelting using the molten iron of desulfurization pretreatment makes molten steel decarburization, dephosphorization, carries out LF essence
Cleaning, slow cooling, obtain slab after refining and sheet billet continuous casting；
Step 2, hot rolling: by the laggard horizontal high voltage water dephosphorization of heating of plate blank, hot-strip is obtained after roughing and finish rolling；
Step 3, pickling and cold-rolling: cooling with the cooling velocity of 20~25 DEG C/s by the hot-strip after hot rolling through chlorohydric acid pickling
For temperature to 650 DEG C, cold rolling obtains cold-rolled strip coil of strip；
Step 4, annealing: will be heated to 800 ± 20 DEG C after chill volume steel band uncoiling, 80~120S be kept the temperature, with the speed of 3~5 DEG C/s
Degree is cooled to 680 ± 20 DEG C, is then cooled to 280 ± 20 DEG C with the cooling velocity greater than 45 DEG C/s, 400~500S of Wetted constructures
It is cooled to 150 DEG C eventually afterwards, is air-cooled to room temperature and obtains the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
4. method as claimed in claim 3, which is characterized in that in the step 1,
Converter smelting tapping temperature is 1630~1650 DEG C；Refine temperature >=1560 DEG C in place.
5. method as claimed in claim 3, which is characterized in that in the step 2,
Slab heating temperature is 1220~1235 DEG C, and heating time is 220~235min；
The start rolling temperature of finish rolling is 1030~1040 DEG C；
The finishing temperature of finish rolling is 860~880 DEG C；
Hot-strip is with a thickness of 4mm.
6. method as claimed in claim 3, which is characterized in that in the step 3,
Cold rolling reduction ratio is 62.5%；
Cold-rolled strip coil of strip is with a thickness of 1.5mm.
7. the cold-rolled biphase steel that a kind of any one of claim 2~6 the method produces, which is characterized in that the cold rolling
Dual phase steel includes the component of following weight percent: C:0.06~0.08%, Si:0.05~0.10%, Mn:1.05~
1.15%, P :≤0.010%, S :≤0.005%, Alt:0.020~0.050%, Cr:0.20~0.30%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110042320A (en) * | 2019-05-27 | 2019-07-23 | 包头钢铁（集团）有限责任公司 | A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
| CN111485177A (en) * | 2020-04-19 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof |
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| CN103938070A (en) * | 2014-04-10 | 2014-07-23 | 马钢(集团)控股有限公司 | Steel plate and preparation method thereof |
| CN104694818A (en) * | 2015-03-26 | 2015-06-10 | 攀钢集团西昌钢钒有限公司 | Production method for carbon structural steel cold-roll steel sheets |
| CN108411202A (en) * | 2018-04-03 | 2018-08-17 | 本钢板材股份有限公司 | A kind of think gauge cold-rolled biphase steel and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938070A (en) * | 2014-04-10 | 2014-07-23 | 马钢(集团)控股有限公司 | Steel plate and preparation method thereof |
| CN104694818A (en) * | 2015-03-26 | 2015-06-10 | 攀钢集团西昌钢钒有限公司 | Production method for carbon structural steel cold-roll steel sheets |
| CN108411202A (en) * | 2018-04-03 | 2018-08-17 | 本钢板材股份有限公司 | A kind of think gauge cold-rolled biphase steel and preparation method thereof |
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| CN110042320A (en) * | 2019-05-27 | 2019-07-23 | 包头钢铁（集团）有限责任公司 | A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
| CN111485177A (en) * | 2020-04-19 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof |
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